Optical Properties Of Er-doped Laser Glasses

Er-doped and Er/Yb co-doped soda-silicate laser glasses with various concentrations of Er and Yb were fabricated. The absoiption and the photoluminescence (PL) spectra were measured and analyzed. For the Er-doped soda-silicate glasses, the optimum Er concentration for the PL intensity at 1536 nm turns out to be 0.5 at.% and the full width at half maximum (FWHM) of PL spectrum increases from 18 to 26 nm with increasing the doping concentration from 0.1 to 0.8 at.%. In the Er/Yb co-doped soda-silicate glasses with an Er concentration of 0.5 at.%, the PL intensity is enhanced by about 4 times, and the optimum Yb concentration for the PL intensity at 1536 nm is analyzed to be 3.0 at.%. The PL spectrum becomes broader with increasing the Yb concentration, up to a FWHM of 80 nm for 6.0 at.% Yb. The relationship between absorption and PL spectra, and the mechanism of PL broadening have also been addressed. For the Er-doped fluoride ceramic glass, bright fluorescence has been observed, pumped by the 980-nm. The energy transfer mechanism has been figured out through the analysis of the dependence of the fluorescence intensity on the pump power.